JP2007207730A - Separator for fuel cell - Google Patents

Separator for fuel cell Download PDF

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JP2007207730A
JP2007207730A JP2006028989A JP2006028989A JP2007207730A JP 2007207730 A JP2007207730 A JP 2007207730A JP 2006028989 A JP2006028989 A JP 2006028989A JP 2006028989 A JP2006028989 A JP 2006028989A JP 2007207730 A JP2007207730 A JP 2007207730A
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reaction
fuel cell
introduction path
reaction gas
sectional area
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JP5137308B2 (en
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Yasunori Yoshimoto
保則 吉本
Akira Hamada
陽 濱田
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a separator for a fuel cell in which occurrence of condensation in a reactive gas passage provided in a separator for a fuel cell is controlled and contribution for a stable operation of the fuel cell is made possible. <P>SOLUTION: The separator 10 for a fuel cell is provided with a manifold 20 for supplying gas, a reactive gas introduction passage 30, an introduction passage expansion part 32 to expand gradually a cross-sectional area of the passage of the reactive gas introduction passage 30, a plurality of reaction part passages 34 formed in parallel with each other, a reactive gas exhaust passage 36, and a manifold 22 for exhausting gas. The reactive gas introduced from the manifold for supplying gas passes, in order, through the reactive gas introduction passage 30, the introduction passage expansion part 32, the reaction part passage 34 and the reactive gas exhausting passage 36, and is exhausted into the manifold for exhausting gas 22. In a connection part of the introduction passage expansion part 32 with the reaction part passage 34, a total of cross-sectional areas of each of reaction part passages 34 is larger than the cross-sectional area of the introduction passage expansion part 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、燃料電池用セパレータに関する。   The present invention relates to a fuel cell separator.

近年、エネルギー変換効率が高く、かつ、発電反応により有害物質を発生しない燃料電池が注目を浴びている。こうした燃料電池の一つとして、１００℃以下の低温で作動する固体高分子形燃料電池が知られている。   In recent years, fuel cells that have high energy conversion efficiency and do not generate harmful substances due to power generation reactions have attracted attention. As one of such fuel cells, a polymer electrolyte fuel cell that operates at a low temperature of 100 ° C. or lower is known.

固体高分子形燃料電池は、電解質膜である固体高分子膜を燃料極と空気極との間に配した基本構造を有し、燃料極に水素を含む燃料ガス、空気極に酸素を含む酸化剤ガスを供給し、以下の電気化学反応により発電する装置である。
燃料極：Ｈ2→２Ｈ+＋２ｅ-（１）
空気極：１／２Ｏ2＋２Ｈ+＋２ｅ-→Ｈ2Ｏ（２）
燃料極においては、供給された燃料中に含まれる水素が上記式（１）に示されるように水素イオンと電子に分解される。このうち水素イオンは固体高分子電解質膜の内部を空気極に向かって移動し、電子は外部回路を通って空気極に移動する。一方、空気極においては、空気極に供給された酸化剤ガスに含まれる酸素が燃料極から移動してきた水素イオンおよび電子と反応し、上記式（２）に示されるように水が生成する。このように、外部回路では燃料極から空気極に向かって電子が移動するため、電力が取り出される。 A polymer electrolyte fuel cell has a basic structure in which a polymer electrolyte membrane, which is an electrolyte membrane, is disposed between a fuel electrode and an air electrode. The fuel electrode contains hydrogen and the air electrode contains oxygen. It is a device that supplies the agent gas and generates power by the following electrochemical reaction.
Fuel electrode: H 2 → 2H ++ 2e - (1)
Air electrode: 1 / 2O 2 + 2H + + 2e − → H 2 O (2)
At the fuel electrode, hydrogen contained in the supplied fuel is decomposed into hydrogen ions and electrons as shown in the above formula (1). Among these, hydrogen ions move inside the solid polymer electrolyte membrane toward the air electrode, and electrons move to the air electrode through an external circuit. On the other hand, in the air electrode, oxygen contained in the oxidant gas supplied to the air electrode reacts with hydrogen ions and electrons that have moved from the fuel electrode, and water is generated as shown in the above formula (2). In this way, in the external circuit, electrons move from the fuel electrode toward the air electrode, so that electric power is taken out.

また、燃料極および空気極の外側にはセパレータが設けられる。燃料極側のセパレータには燃料ガス流路が設けられており、燃料極に燃料ガスが供給される。同様に、空気極側のセパレータにも酸化剤ガス流路が設けられ、空気極に酸化剤ガスが供給される。なお、本明細書において、燃料ガスおよび酸化剤ガスを合わせて「反応ガス」と呼ぶ。また、これらのセパレータ間には、電極を冷却するための冷却水の流路が設けられる。   A separator is provided outside the fuel electrode and the air electrode. The separator on the fuel electrode side is provided with a fuel gas flow path, and fuel gas is supplied to the fuel electrode. Similarly, an oxidant gas flow path is also provided in the separator on the air electrode side, and oxidant gas is supplied to the air electrode. In this specification, the fuel gas and the oxidant gas are collectively referred to as “reaction gas”. In addition, a flow path of cooling water for cooling the electrodes is provided between these separators.

図４は、従来の燃料電池用セパレータ１００の構造を示す断面図である。図５は、図４のＹ−Ｙ’線上の断面図である。図６は、図４のＹ−Ｙ’線上の反応ガス流路の断面積を示すグラフである。従来の燃料電池用セパレータ１００では、反応ガス供給用のマニホールド１０２から導入された反応ガスは、接続路１０３を経由して、互いに平行に形成された複数の反応部流路１０４に分配され、電気化学反応に用いられた後、接続路１０５を経由して、反応ガス排出用のマニホールド１０６に排出される。従来の燃料電池用セパレータ１００では、反応部流路１０４を隔てる隔壁の分だけ、反応部流路１０４の入り口部分で反応ガスが流通する流路の断面積が減少している（図６参照）。
特開２００４−３２７４２５号公報 FIG. 4 is a cross-sectional view showing the structure of a conventional fuel cell separator 100. 5 is a cross-sectional view taken along line YY ′ of FIG. FIG. 6 is a graph showing the cross-sectional area of the reaction gas channel on the YY ′ line of FIG. In the conventional fuel cell separator 100, the reaction gas introduced from the reaction gas supply manifold 102 is distributed to a plurality of reaction section flow paths 104 formed in parallel with each other via a connection path 103. After being used for the chemical reaction, it is discharged to the reaction gas discharge manifold 106 via the connection path 105. In the conventional fuel cell separator 100, the cross-sectional area of the flow path through which the reaction gas flows at the entrance of the reaction section flow path 104 is reduced by the amount of the partition that separates the reaction section flow path 104 (see FIG. 6). .
JP 2004-327425 A

固体高分子形燃料電池において電解質として用いられる固体高分子膜は、湿潤状態でイオン導電性を発現するため、反応ガスを相対湿度１００％近い湿度、または１００％以上となるように加湿して供給することが望ましい。   A solid polymer membrane used as an electrolyte in a polymer electrolyte fuel cell expresses ionic conductivity in a wet state, so that the reaction gas is humidified and supplied so that the relative humidity is close to 100% or more than 100%. It is desirable to do.

しかし、相対湿度１００％に近い湿度となるように反応ガスを加湿して供給しようとすると、反応ガスがセパレータに設けられた流路の上流側で結露する可能性が高くなる。具体的には、図４のような従来の燃料電池セパレータでは、反応部流路１０４の入り口部分で反応ガスが流通する流路の断面積が急減するため、反応ガスが圧縮された結果、反応部流路１０４の入り口部分に結露水が生じやすかった。この状態で結露水が上述した電気化学反応が起きる部分の流路に供給されると反応ガスの流れが阻害され、燃料電池の動作が不安定化することがあった。   However, if the reaction gas is humidified and supplied so that the humidity is close to 100% relative humidity, there is a high possibility that the reaction gas will dew on the upstream side of the flow path provided in the separator. Specifically, in the conventional fuel cell separator as shown in FIG. 4, the reaction gas is compressed as a result of the reaction gas being compressed because the cross-sectional area of the flow channel through which the reaction gas flows is rapidly reduced at the entrance of the reaction channel 104. Condensed water was likely to be generated at the entrance of the partial flow path 104. In this state, if the condensed water is supplied to the flow path of the portion where the electrochemical reaction described above occurs, the flow of the reaction gas is obstructed and the operation of the fuel cell may become unstable.

そのため、従来技術では、内部マニホールド内で結露水を落とす工夫がなされていたが、結露水の排出口が必要になるため複雑になる問題があった。   For this reason, in the prior art, a device for dropping the condensed water in the internal manifold has been devised, but there is a problem that it becomes complicated because an outlet for the condensed water is required.

本発明はこうした課題に鑑みてなされたものであり、その目的は、反応ガス流路内における結露水の発生を抑制することにより、燃料電池の動作の安定化に寄与する燃料電池用セパレータの提供にある。   The present invention has been made in view of these problems, and an object of the present invention is to provide a fuel cell separator that contributes to stabilization of the operation of the fuel cell by suppressing the generation of condensed water in the reaction gas flow path. It is in.

本発明のある態様は、燃料電池用セパレータである。この燃料電池用セパレータは、反応ガスが供給されるマニホールドと、マニホールドと連通する反応ガス導入路と、反応ガス導入路の出口と接続し、反応ガス導入路との接続部分を基点として断面積が徐々に増加する導入路拡張部と、導入路拡張部と接続し、導入路拡張部を通過した反応ガスが分配される複数の反応部流路と、を備え、導入路拡張部と複数の反応部流路との接続部分において、複数の反応部流路の総断面積が導入路拡張部の断面積以上であることを特徴とする。   One embodiment of the present invention is a fuel cell separator. This fuel cell separator is connected to a manifold to which a reaction gas is supplied, a reaction gas introduction path communicating with the manifold, and an outlet of the reaction gas introduction path, and has a cross-sectional area starting from the connection portion with the reaction gas introduction path. A gradually increasing introduction path extension section, and a plurality of reaction section flow paths that are connected to the introduction path extension section and to which the reaction gas that has passed through the introduction path extension section is distributed. The total cross-sectional area of the plurality of reaction part flow paths is greater than or equal to the cross-sectional area of the introduction path expansion part in the connection portion with the partial flow path.

これによれば、導入路拡張部と複数の反応部流路との接続部分において、各反応流路に分配される反応ガスが凝縮し、反応ガスに含まれる水分が液体化することが抑制される。この結果、各反応部流路への反応ガスの分配が阻害されることなく、速やかに進行するため、各反応流路に適度な反応ガスが流通し、燃料電池の動作が安定化する。   According to this, the reaction gas distributed to each reaction flow channel is condensed at the connection portion between the introduction channel expansion portion and the plurality of reaction flow channels, and the moisture contained in the reaction gas is suppressed from being liquefied. The As a result, the reaction gas is rapidly distributed without being disturbed to each reaction part flow path, so that an appropriate reaction gas flows through each reaction flow path and the operation of the fuel cell is stabilized.

上記態様の燃料電池用セパレータにおいて、導入路拡張部と複数の反応部流路との接続部分を基点として、各反応部流路の幅が徐々に狭くなり、各反応部流路の高さが各反応部流路の幅の減少量に応じて増加していてもよい。   In the fuel cell separator according to the above aspect, the width of each reaction channel is gradually narrowed starting from the connection portion between the introduction channel extension and the plurality of reaction channels, and the height of each reaction channel is You may increase according to the decreasing amount of the width | variety of each reaction part flow path.

これによれば、反応部流路の幅の減少量を反応部流路の高さで補うことにより、導入路拡張部と複数の反応部流路との接続部分において、複数の反応部流路の総断面積を導入路拡張部の断面積以上とすることができる。   According to this, a plurality of reaction section flow paths are connected at the connection portion between the introduction path expanding section and the plurality of reaction section flow paths by compensating for the decrease in the width of the reaction section flow path with the height of the reaction section flow path. The total cross-sectional area can be greater than or equal to the cross-sectional area of the introduction path expanding portion.

上記態様の燃料電池用セパレータにおいて、反応部流路における反応ガスの流れ方向に沿った導入路拡張部の所定位置での断面積が、所定位置より外側に位置する反応部流路の総断面積以下であってもよい。   In the fuel cell separator according to the above aspect, the total cross-sectional area of the reaction part flow path in which the cross-sectional area at a predetermined position of the introduction path extension along the reaction gas flow direction in the reaction part flow path is located outside the predetermined position. It may be the following.

これによれば、導入路拡張部内で広がった反応ガスの流量が、当該反応ガスが流れ込む反応部流路の許容範囲となるため、導入路拡張部と複数の反応部流路との接続部分において凝縮水が発生することが抑制される。   According to this, since the flow rate of the reaction gas that has spread in the introduction path expansion section is within the allowable range of the reaction section flow path into which the reaction gas flows, in the connection portion between the introduction path expansion section and the plurality of reaction section flow paths. Generation of condensed water is suppressed.

本発明の燃料電池用セパレータによれば、反応ガス流路における結露が抑制される。   According to the fuel cell separator of the present invention, condensation in the reaction gas flow path is suppressed.

以下、本発明の実施の形態を図面を参照して説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、実施形態に係る燃料電池用セパレータ１０の構造を示す平面図である。図２は、図１のＸ−Ｘ’線上の断面図である。図３は、図１のＸ−Ｘ’線上の反応ガス流路の断面積を示すグラフである。   FIG. 1 is a plan view showing a structure of a fuel cell separator 10 according to an embodiment. FIG. 2 is a cross-sectional view taken along line X-X ′ of FIG. 1. FIG. 3 is a graph showing the cross-sectional area of the reaction gas channel on the X-X ′ line in FIG. 1.

燃料電池用セパレータ１０には、ガス供給用マニホールド２０、反応ガス導入路３０、導入路拡張部３２、反応部流路３４、反応ガス排出路３６、ガス排出用マニホールド２２が設けられている。ガス供給用マニホールド２０に供給された反応ガスは、反応ガス導入路３０、導入路拡張部３２、反応部流路３４、反応ガス排出路３６の順に通過した後、ガス排出用マニホールド２２に排出される。   The fuel cell separator 10 is provided with a gas supply manifold 20, a reaction gas introduction path 30, an introduction path expansion section 32, a reaction section flow path 34, a reaction gas discharge path 36, and a gas discharge manifold 22. The reaction gas supplied to the gas supply manifold 20 passes through the reaction gas introduction path 30, the introduction path expansion section 32, the reaction section flow path 34, and the reaction gas discharge path 36 in this order, and is then discharged to the gas discharge manifold 22. The

また、燃料電池用セパレータ１０には、燃料電池用セパレータ１０の流路に流れる反応ガスと対になる反応ガス供給用のマニホールドとして使用される貫通穴２４、および上記対になる反応ガス排出用のマニホールドとして使用される貫通穴２５が形成されている。ここで、燃料電池用セパレータ１０の流路に流れる反応ガスと対になる反応ガスは、燃料電池用セパレータ１０の流路に流れる反応ガスが水素を含む燃料ガスの場合には酸素を含む空気などの酸化剤ガスであり、逆に、燃料電池用セパレータ１０の流路に流れる反応ガスが酸素を含む空気などの酸化剤ガスの場合には水素を含む燃料ガスである。さらに、燃料電池用セパレータ１０には、冷却水供給用のマニホールドとして使用される貫通穴２６、および冷却水排出用のマニホールドとして使用される貫通穴２７が形成されている。   The fuel cell separator 10 includes a through hole 24 used as a reaction gas supply manifold that is paired with the reaction gas flowing in the flow path of the fuel cell separator 10, and the pair of reaction gas discharges. A through hole 25 used as a manifold is formed. Here, the reaction gas paired with the reaction gas flowing in the flow path of the fuel cell separator 10 is, for example, air containing oxygen when the reaction gas flowing in the flow path of the fuel cell separator 10 is a fuel gas containing hydrogen. On the contrary, when the reaction gas flowing in the flow path of the fuel cell separator 10 is an oxidant gas such as air containing oxygen, it is a fuel gas containing hydrogen. Further, the fuel cell separator 10 is formed with a through hole 26 used as a cooling water supply manifold and a through hole 27 used as a cooling water discharge manifold.

反応ガス導入路３０の入口は、ガス供給用マニホールド２０と連通している。反応ガス導入路３０にはガス供給用マニホールド２０に供給された反応ガスが導入される。   The inlet of the reaction gas introduction path 30 communicates with the gas supply manifold 20. The reaction gas supplied to the gas supply manifold 20 is introduced into the reaction gas introduction path 30.

導入路拡張部３２は、反応ガス導入路の出口と接続している。導入路拡張部３２は、反応ガス導入路３０との接続部分３３を基点として断面積が徐々に増加している（図３参照）。具体的には、上流側から下流側へ向かって導入路拡張部３２の高さが一定であるのに対して、上流側から下流側へ向かって導入路拡張部３２の幅が徐々に広げられている。導入路拡張部３２により、反応ガス導入路３０を通過した反応ガスが拡散する。   The introduction path extension 32 is connected to the outlet of the reaction gas introduction path. The introduction path extending portion 32 gradually increases in cross-sectional area starting from the connection portion 33 with the reaction gas introduction path 30 (see FIG. 3). Specifically, the height of the introduction path expansion portion 32 is constant from the upstream side toward the downstream side, whereas the width of the introduction path expansion portion 32 is gradually widened from the upstream side toward the downstream side. ing. The reaction gas that has passed through the reaction gas introduction passage 30 is diffused by the introduction passage extension portion 32.

複数の反応部流路３４は、導入路拡張部３２に接続され、燃料電池用セパレータ１０の一方の面に互いに平行な溝状に形成されている。導入路拡張部３２を通過した反応ガスは、複数の反応部流路３４に分配される。本実施形態では、導入路拡張部３２と反応部流路３４との接続部分において、個々の反応部流路３４の断面積が合計が導入路拡張部３２の断面積と同等になっている。具体的には、導入路拡張部３２と複数の反応部流路３４との接続部分を基点として、各反応部流路３４の幅が徐々に狭くなるにつれて、各反応部流路３４を形成する溝３５の深さが深くなることにより、各反応部流路３４の高さが幅の減少量に応じて増加している（図２参照）。このように、反応部流路３４の幅の減少量を反応部流路３４の高さで補うことにより、導入路拡張部３２と複数の反応部流路３４との接続部分において、複数の反応部流路３４の総断面積を導入路拡張部３２の断面積と同等としている。なお、反応部流路３４の高さをより大きくすることにより、導入路拡張部３２と反応部流路３４との接続部分において、個々の反応部流路３４の断面積が合計が導入路拡張部３２の断面積以上にしてもよい。   The plurality of reaction section flow paths 34 are connected to the introduction path extending section 32 and are formed in a groove shape parallel to each other on one surface of the fuel cell separator 10. The reaction gas that has passed through the introduction path expansion section 32 is distributed to the plurality of reaction section flow paths 34. In the present embodiment, the total cross-sectional area of each reaction part flow path 34 is equal to the cross-sectional area of the introduction path extension part 32 at the connection portion between the introduction path extension part 32 and the reaction part flow path 34. Specifically, each reaction section flow path 34 is formed as the width of each reaction section flow path 34 becomes narrower with the connection portion between the introduction path expansion section 32 and the plurality of reaction section flow paths 34 as a base point. As the depth of the groove 35 becomes deeper, the height of each reaction section channel 34 increases in accordance with the amount of decrease in width (see FIG. 2). As described above, the amount of reduction in the width of the reaction section flow path 34 is compensated by the height of the reaction section flow path 34, whereby a plurality of reactions are performed at the connection portion between the introduction path expansion section 32 and the plurality of reaction section flow paths 34. The total cross-sectional area of the partial flow path 34 is made equal to the cross-sectional area of the introduction path expanding part 32. In addition, by making the height of the reaction section flow path 34 larger, the total cross-sectional area of the individual reaction section flow paths 34 is expanded at the connection portion between the introduction path expansion section 32 and the reaction section flow path 34. You may make it more than the cross-sectional area of the part 32. FIG.

これによれば、導入路拡張部３２と複数の反応部流路３４との接続部分において、各反応流路に分配される反応ガスが凝縮し、反応ガスに含まれる水分が結露することが抑制される。この結果、各反応部流路への反応ガスの分配が阻害されることなく、速やかに進行するため、各反応流路に適度な反応ガスが流通し、燃料電池の動作が安定化する。   According to this, the reaction gas distributed to each reaction channel is condensed and the moisture contained in the reaction gas is prevented from condensing at the connection portion between the introduction channel expansion unit 32 and the plurality of reaction unit channels 34. Is done. As a result, the reaction gas is rapidly distributed without being disturbed to each reaction part flow path, so that an appropriate reaction gas flows through each reaction flow path and the operation of the fuel cell is stabilized.

さらに、本実施形態の燃料電池用セパレータ１０は、反応部流路３４における反応ガスの流れ方向に沿った導入路拡張部３２の所定位置での断面積が、所定位置より外側に位置する反応部流路３４の総断面積以下になっている。具体的には、図１のＡ−Ａ’線上の導入路拡張部３２断面積がＡ−Ａ’線より外側の４本の反応部流路３４の断面積の合計以下になっている。同様に、図１のＢ−Ｂ’線上の断面積がＢ−Ｂ’線より外側の１本の反応部流路３４の断面積の合計以下になっている。   Further, in the fuel cell separator 10 of the present embodiment, the reaction section in which the cross-sectional area at a predetermined position of the introduction path expansion section 32 along the flow direction of the reaction gas in the reaction section flow path 34 is located outside the predetermined position. The total cross-sectional area of the flow path 34 is less than or equal to. Specifically, the cross-sectional area of the introduction path expansion portion 32 on the A-A ′ line in FIG. 1 is equal to or less than the sum of the cross-sectional areas of the four reaction portion flow paths 34 outside the A-A ′ line. Similarly, the cross-sectional area on the B-B ′ line in FIG. 1 is equal to or less than the sum of the cross-sectional areas of the single reaction section flow path 34 outside the B-B ′ line.

図１に示すように、反応ガス導入路３０から導入路拡張部３２に流れ込んだ反応ガスの一部は、外側に向かって矢印Ｓの方向に広がる。このため、導入路拡張部３２内の反応ガスの流れに直交する方向は、実質的に、たとえば図１のＡ−Ａ’方向になる。図１のＡ−Ａ’線より外側に広がった反応ガスは、図１のＡ−Ａ’線より外側の反応部流路３４に分配される。これにより、導入路拡張部３２内で広がった反応ガスの流量が、当該反応ガスが流れ込む反応部流路３４の許容範囲となるため、導入路拡張部３２と複数の反応部流路と３４の接続部分において凝縮水が発生することが抑制される。   As shown in FIG. 1, a part of the reaction gas that has flowed from the reaction gas introduction passage 30 into the introduction passage extension portion 32 spreads in the direction of the arrow S toward the outside. For this reason, the direction orthogonal to the flow of the reaction gas in the introduction path extension 32 is substantially the A-A ′ direction of FIG. 1, for example. The reaction gas spreading outward from the line A-A ′ in FIG. 1 is distributed to the reaction section flow path 34 outside the line A-A ′ in FIG. 1. As a result, the flow rate of the reaction gas that has spread within the introduction path expansion section 32 is within the allowable range of the reaction section flow path 34 into which the reaction gas flows, so that the introduction path expansion section 32 and the plurality of reaction section flow paths 34 Condensed water is prevented from being generated at the connecting portion.

本発明は、上述の各実施の形態に限定されるものではなく、当業者の知識に基づいて各種の設計変更等の変形を加えることも可能であり、そのような変形が加えられた実施の形態も本発明の範囲に含まれうるものである。   The present invention is not limited to the above-described embodiments, and various modifications such as design changes can be added based on the knowledge of those skilled in the art. The form can also be included in the scope of the present invention.

実施形態に係る燃料電池用セパレータの構造を示す平面図である。It is a top view which shows the structure of the separator for fuel cells which concerns on embodiment. 図１のＸ−Ｘ’線上の断面図である。It is sectional drawing on the X-X 'line | wire of FIG. 図１のＸ−Ｘ’線上の反応ガス流路の断面積を示すグラフである。It is a graph which shows the cross-sectional area of the reaction gas flow path on the X-X 'line of FIG. 従来の燃料電池用セパレータの構造を示す平面図である。It is a top view which shows the structure of the conventional separator for fuel cells. 図４のＹ−Ｙ’線上の断面図である。FIG. 5 is a cross-sectional view taken along line Y-Y ′ of FIG. 4. 図４のＹ−Ｙ’線上の反応ガス流路の断面積を示すグラフである。It is a graph which shows the cross-sectional area of the reactive gas flow path on the Y-Y 'line | wire of FIG.

符号の説明Explanation of symbols

１０ 燃料電池用セパレータ、２０ ガス供給用マニホールド、２２ ガス排出用マニホールド、３０ 反応ガス導入路、３２ 導入路拡張部、３４ 反応部流路、３６ 反応ガス排出路。   10 Fuel Cell Separator, 20 Gas Supply Manifold, 22 Gas Discharge Manifold, 30 Reactive Gas Introducing Path, 32 Introducing Channel Expansion Portion, 34 Reacting Port Channel, 36 Reacting Gas Discharge Channel

Claims (3)

反応ガスが供給されるマニホールドと、
前記マニホールドと連通する反応ガス導入路と、
前記反応ガス導入路の出口と接続し、前記反応ガス導入路との接続部分を基点として断面積が徐々に増加する導入路拡張部と、
前記導入路拡張部と接続し、前記導入路拡張部を通過した反応ガスが分配される複数の反応部流路と、
を備え、
前記導入路拡張部と前記複数の反応部流路との接続部分において、前記複数の反応部流路の総断面積が前記導入路拡張部の断面積以上であることを特徴とする燃料電池用セパレータ。 A manifold to which the reaction gas is supplied;
A reaction gas introduction path communicating with the manifold;
Connected to the outlet of the reaction gas introduction path, and an introduction path extension portion where the cross-sectional area gradually increases with the connection portion with the reaction gas introduction path as a base point;
A plurality of reaction part flow paths that are connected to the introduction path extension part and into which the reaction gas that has passed through the introduction path extension part is distributed;
With
For a fuel cell, wherein a total cross-sectional area of the plurality of reaction portion flow paths is equal to or larger than a cross-sectional area of the introduction path expansion portion at a connection portion between the introduction path expansion portion and the plurality of reaction portion flow paths. Separator. 前記導入路拡張部と前記複数の反応部流路との接続部分を基点として、各反応部流路の幅が徐々に狭くなり、各反応部流路の高さが各反応部流路の幅の減少量に応じて増加していることを特徴とする請求項１に記載の燃料電池用セパレータ。   Starting from the connection portion between the introduction path expansion section and the plurality of reaction section flow paths, the width of each reaction section flow path gradually decreases, and the height of each reaction section flow path is the width of each reaction section flow path. The fuel cell separator according to claim 1, wherein the fuel cell separator increases in accordance with a decrease amount of the fuel cell. 前記反応部流路における反応ガスの流れ方向に沿った前記導入路拡張部の所定位置での断面積が、前記所定位置より外側に位置する反応部流路の総断面積以下であることを特徴とする請求項１または２に記載の燃料電池用セパレータ。

A cross-sectional area at a predetermined position of the introduction path extension along the flow direction of the reaction gas in the reaction section flow path is equal to or less than a total cross-sectional area of the reaction section flow path located outside the predetermined position. The fuel cell separator according to claim 1 or 2.

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